Control Information Transmission Method, Apparatus, and System

1. A control information sending method, wherein the method comprises: sending, by a first terminal apparatus, first control information to a second terminal apparatus in an ith slot, wherein i is an integer greater than or equal to 0, and the first control information comprises resource indication information and decoding information; sending, by the first terminal apparatus, second control information to the second terminal apparatus in an (i+j)th slot, wherein j is an integer greater than or equal to 1 and less than or equal to N, N is an integer greater than or equal to 1, and the second control information comprises the resource indication information; and sending, by the first terminal apparatus, first data to the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information, wherein M is an integer greater than or equal to 1 and less than or equal to N.

2. The method according to claim 1, wherein M is equal to N, and the sending, by the first terminal apparatus, first data to the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information comprises: sending, by the first terminal apparatus, the first data to the second terminal apparatus in the ith slot and the (i+1)th slot to the (i+N)th slot based on the first control information and N pieces of second control information.

3. The method according to claim 1, wherein the sending, by the first terminal apparatus, first data to the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information comprises: sending, by the first terminal apparatus, the first data to the second terminal apparatus in M slots in the ith slot and the (i+1)th slot to the (i+N)th slot based on the first control information and the M pieces of second control information.

4. The method according to claim 1, wherein the first control information comprises first-stage control information and second-stage control information, the second control information comprises the first-stage control information, the first-stage control information is the resource indication information, and the second-stage control information is the decoding information.

5. The method according to claim 1, wherein the second control information is newly defined sidelink control information, and the newly defined sidelink control information comprises the resource indication information.

6. The method according to any claim 1, wherein M is equal to 1, and the sending, by the first terminal apparatus, second control information to the second terminal apparatus in an (i+j)th slot comprises: sending, by the first terminal apparatus, the second control information to the second terminal apparatus in the (i+N)th slot.

7. The method according to claim 1, wherein the first control information comprises indication information, and the indication information is used to indicate slot positions of the M pieces of second control information in the (i+1)th slot to the (i+N)th slot.

8. The method according to claim 7, wherein the indication information is an index value, and the sending, by the first terminal apparatus, second control information to the second terminal apparatus in an (i+j)th slot comprises: when the index value is 0, sending, by the first terminal apparatus, the second control information to the second terminal apparatus in the (i+N)th slot; and when the index value is 1, sending, by the first terminal apparatus, the second control information in an even slot in the (i+1)th slot to the (i+N)th slot.

9. The method according to claim 1, wherein the resource indication information comprises at least one of resource reservation information and a resource priority, and the decoding information comprises at least one of hybrid automatic repeat request HARQ related information and a modulation and coding scheme MCS.

10. A control information sending method, wherein the method comprises: sending, by a first terminal apparatus, first control information to a second terminal apparatus in an ith frequency domain unit, wherein i is an integer greater than or equal to 0, and the first control information comprises resource indication information and decoding information; sending, by the first terminal apparatus, second control information to the second terminal apparatus in an (i+j)th frequency domain unit, wherein j is an integer greater than or equal to 1 and less than or equal to N1 or an integer greater than or equal to −N2 and less than or equal to −1, both N1 and N2 are integers greater than or equal to 1, and the second control information comprises the resource indication information; and sending, by the first terminal apparatus, first data to the second terminal apparatus in an (i−N2)th frequency domain unit to an (i+N1)th frequency domain unit based on the first control information and M pieces of second control information, wherein M is an integer greater than or equal to 1 and less than or equal to (N1+N2).

11. The method according to claim 10, wherein M is equal to N1+N2, and the sending, by the first terminal apparatus, first data to the second terminal apparatus in an (i−N2)th frequency domain unit to an (i+N1)th frequency domain unit based on the first control information and M pieces of second control information comprises: sending, by the first terminal apparatus, the first data to the second terminal apparatus in the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit based on the first control information and N1+N2 pieces of second control information.

12. The method according to claim 10, the sending, by the first terminal apparatus, first data to the second terminal apparatus in an (i−N2)th frequency domain unit to an (i+N1)th frequency domain unit based on the first control information and M pieces of second control information comprises: sending, by the first terminal apparatus, the first data to the second terminal apparatus in M frequency domain units in the ith frequency domain unit and the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit except the ith frequency domain unit based on the first control information and the M pieces of second control information.

13. The method according to claim 10, wherein the first control information comprises first-stage control information and second-stage control information, the second control information comprises the first-stage control information, the first-stage control information is the resource indication information, and the second-stage control information is the decoding information.

14. The method according to claim 10, wherein the second control information is newly defined sidelink control information, and the newly defined sidelink control information comprises the resource indication information.

15. The method according to claim 10, wherein the first control information comprises indication information, and the indication information is used to indicate frequency domain unit positions of the M pieces of second control information in the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit except the ith frequency domain unit.

16. The method according to claim 15, wherein the indication information is an index value, and the sending, by the first terminal apparatus, second control information to the second terminal apparatus in an (i+j)th frequency domain unit comprises: when the index value is 0, sending, by the first terminal apparatus, the second control information to the second terminal apparatus in the (i+N1)th frequency domain unit; when the index value is 1, sending, by the first terminal apparatus, the second control information in an even frequency domain unit in the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit except the ith frequency domain unit; when the index value is 2, sending, by the first terminal apparatus, the second control information in an odd frequency domain unit in the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit except the ith frequency domain unit; and when the index value is 3, sending, by the first terminal apparatus, the second control information in the (i−N2)th frequency domain unit to the (i+N1)th frequency domain unit except the ith frequency domain unit.

17. The method according to claim 10, wherein the resource indication information comprises at least one of resource reservation information and a resource priority, and the decoding information comprises at least one of hybrid automatic repeat request HARQ related information and a modulation and coding scheme MCS.

18. A control information receiving method, wherein the method comprises: receiving, by a second terminal apparatus in an ith slot, first control information sent by a first terminal apparatus, wherein i is an integer greater than or equal to 0, and the first control information comprises resource indication information and decoding information; receiving, by the second terminal apparatus in an (i+j)th slot, second control information sent by the first terminal apparatus, wherein j is an integer greater than or equal to 1 and less than or equal to N, N is an integer greater than or equal to 1, and the second control information comprises the resource indication information; and receiving, by the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information, first data sent by the first terminal apparatus, wherein M is an integer greater than or equal to 1 and less than or equal to N.

19. The method according to claim 18, wherein M is equal to N, and the receiving, by the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information, first data sent by the first terminal apparatus comprises: receiving, by the second terminal apparatus in the ith slot and the (i+1)th slot to the (i+N)th slot based on the first control information and N pieces of second control information, the first data sent by the first terminal apparatus.

20. The method according to claim 18, wherein the receiving, by the second terminal apparatus in the ith slot and an (i+1)th slot to an (i+N)th slot based on the first control information and M pieces of second control information, first data sent by the first terminal apparatus comprises: receiving, by the second terminal apparatus in M slots in the ith slot and the (i+1)th slot to the (i+N)th slot based on the first control information and the M pieces of second control information, the first data sent by the first terminal apparatus.